Scavenger roll mechanism



Patented Mar. 23,l 1948 SCAVENGER ROLL MECHANISM- John A. Kooistra, North Andover, Mass., assigner to Davis & Farber Machine Company, North Andover, Mass., a corporation of Massachusetts Application June 4, 1947, Serial No. 752,412

claims. 1

This invention relates to the scavenger roll mechanism of a yarn forming frame, such for example as a spinning frame in which the scavenger rolls are mounted in pairs on individual shafts, one pair for each pair of drawing rolls.

The object of the invention is to provide a simple and eflicient means for driving the scavenger rolls.

The object of the invention is further to provide a construction enabling each scavenger roll shaft with its pair of scavenger rolls, independently of the others, readily to be removed and replaced either as required by cleaning, repairing, or substitution. i

The object of the invention is further to enable each bearing bracket for each scavenger roll shaft, independently of the others, readily to be removed and replaced.

These and other objects and features of the invention will appear. more fully from the accompanying drawing and description and will be particularly pointed out in the claims.

The invention is applicable to any type of yarn forming frame for twisting, spinning, or handling any type of brous strand where it is desirable to employ scavenger rolls. Since there are a wide variety of such frames depending upon the particular kind of fiber being processed and the particular stage in the process and since the invention is applicable to any such, it is only necessary to illustrate and describe one example of the parts of one such frame in connection with a disclosure of a preferred form of the present invention. In all such frames there are arranged at spaced intervals sets of horizontally alined cooperating drawing rolls including for their operation a common horizontal driving shaft. If there is but one such horizontal shaft, it is positively driven, by suitable connections in the frame, and if there are two such shafts extending throughout the alined cooperating drawing rolls, one of these shafts is usually positively driven and the other driven in turn therefrom.

It will be understood that a fibrous strand is fed forward between each .set of drawing rolls by the rotation thereof and that the scavenger roll is placed beneath the drawing rolls so that if the strand breaks, it will be caught by, and wound upon, the scavenger roll so as not to become entangled in the machine. When this happens, the operator pieces the broken strand to continue the operation and removes from the scavenger roll the portion of the strand which has been wound thereon.

The yarn forming frames often extend a greater length with the sets of cooperating drawing rolls at spaced intervals throughout the length of the frame. Since the construction is the same throughout, it is only necessary to illustrate and refer to but two sets of such drawing rolls. Heretofore a stub shaft with a frusto-conical scavenger roll at each end thereof has been associated with each two sets of the drawing rolls but a special driving shaft has been provided for operating these series of independent scavenger roll stub shafts thus requiring bearings for this shaft throughout the machine, a drive therefor, and no means for ready removal and replacement of the scavenger roll shafts and their supports.

In the drawings:

Fig. 1 1s a front elevation of such portion of a yarn forming frame, more particularly a spinning frame, as is suicient for a disclosure of the present invention,

Fig. 2 is a view generally in side elevation and partially in cross section on the line 2 2, Fig. 1, with some additional portions of the frame ineluded.

In the construction illustrated each set of drawing rolls is shown as comprising an upper luted roll I0, a cooperating lower iluted roll II, and a pressure roll I2, the latter roll being removed in Fig. 1. These sets extend in horizontal alinement throughout the length of the frame. In the particular construction illustrated, the lower rolls I l are all mounted upon, or formed from part of, a common horizontal shaft I3 and similarly the upper rolls Illare all mounted upon, or form part of, another horizontal shaft I4 extending in parallelism with the shaft I3. In this construction both of these shafts I3 and I4 are driven. The lower shaft I3 having a beveled gear I5 driven from any suitable driving connection in the frame, and the upper shaft I4 being driven from the lower shaft by means of the sprocket chain I6 engaging sprocket wheels on their respective shafts.

The yarn strand in the usual manner is fed forwardly between the cooperating rolls I0 and I I and beneath the pressure roll I2, when employed, to any of the usual mechanisms employed in twisting, spinning, or otherwise forming yarn in a manner well known to those skilled in the art.

There is provided with each two adjacent sets of the cooperating rolls, such' as illustrated in Fig. 1, a stub shaft Il having free ends and on each of these free ends is mounted a frusto-conical scavenger roll I8 with the larger end toward the center and the small end toward the free end of the shaft. This roll as usual may be covered the scavenger rolls, and a belt 20 ,extends arourlilv this pulley and the shaft I3 between the sets ,of the drawing rolls. 'I'he stubshaftll is supported in a bearing bracket having varms 2l presenting at their upper ends bearings for the stub shaft at oppositesides of the pu1ley"`|9. This baring bracket is provided with a pivot 22 shown as av short shaft connecting the arms 2l at their lower -ends and this pivot is journaled in a support 23 mounted Yon a suitable portion 24 of the-frame.

' These parts are alsopositioned asto present the two scavenger l rolls *respectively beneath `adjacent` sets of drawing rollsY such as the two ysets illustrated.;V

Each vbearing'bracket isextended rearwardly fron'rits. Ypivotal; Y25, and this extensionlin-s connected by a suitable spring 2 3 to some` xe'dgportion 21 of the frame kso that't-here -isvagspring between the bearing bracket-and the frame which acts to maintain tension on the vbeltl andthus.

insure that Veach stub shaft with Vits 'scavenger roll-s shall be independently and positively driven from the shaft I3. 1

The bearings for the stub shaft in the Varnis 2l of the bearing, bracket are as shown openbearings andfaced downwardly.' Thusby releasing the tension ofv the spring, the bearingv bracket may be swung counter-*clockwise on the support 23 thusenabling the stub-shaft with the scavenger rolls entirely to be removed from thebearings, slipped out through the belt and-repaired or -renewed or replaced.v Y

The bearing onthe support A23 for the pivot 22 of the bearing bracket `also VVas shown; isfopen andy faces -dojwnwardjso thatl when the spring 26 i Yis `released,-tl1eentireY bearing bracket with Vthe stub'shaft anclscavengerrolls may bereadily removed from the frame Yand repaired or renewed or replaced.V

There is thus presentada veryA simpleA and efficient mechanism byrmeans-of which each pair of scavenger rolls is independently driven directly from a, driven shaft'common to the associated sets of drawing rollsthu-s requiring no additional driving shaft or mechanism vthan that required vfor driving Ythe dra-wing rolls themselves, and

furtliermoreY -each stub shaft with its scavenger Y rolls and each'bearing bracket therefor are findependently readily removed and vreplacedY when- Y ever desired.

Having thus described the invention, `what is claimed as new, and desired to be secured by Letters Patent, is: Y

l. In a yarn forming frame provided at spaced intervals with sets of horizontally alined cooperating drawing rolls including a common horizontal driven'shaft therefor the combination of a 4stub shaft having free ends, a frusto-conical scavenger roll mounted on each end of the stub shaft, a pulley mounted onthe stub shaft centrally thereof and between thelarger ends ofthe scavenger rolls, a bearing bracket having bearings for the stub shaft at opposite sides of the pulley and pivotally mounted on the frame be- .around the pulley and the driven drawing roll shaft between said adjacent sets of drawing rolls,"

neath and parallel to the drawingrolls to position the scavenger rolls respectively beneath adjacent Vsets of Vdrawing rolls, a belt extending and a spring between vthe bearing bracket and the frame acting to tension the belt;

Y2. Y1n a yarnfforming frame having the combination deilnedin claim y1 ,V` in' whichthe' said bearings Afor the `stub{shaft are open anddownwarldly facing to enable the stub shaft, `uponlrelaxation of the s pringyreadily'to fberembved *and replaced.. Y

V3. ln a yarn formingrframefhaving thecoinbination defined in claim 2, in which `the frame beneaththe bearing :bracket is provided with a support having a downwardly facingopen'bearing and inwhich -thebearing bracket is pivotally mounted onth'e frame by! means lof a shaftfsecured ln'fthebracketand mounted-in the open bearing of the Vsup-port thus toena'bfle, upon' `disconnection of the spring, the Vbearing 'bracket readily. to be removedandireplaced;V S

4. In a yarn' forming fra-me provided vat spaced intervals with sets of horizontally alined cooperating drawing rollsn'cluding a common-horizontal driven shaft therefor thecombinationlof a stub shaft 'having free end's,a frusto-conical scavenger roll mounted-1 on each `'en'dbf the stub shaft, a belt extending around the central portion of the ystuloshaftand the driven-drawing roll shaft between/'said Vadjacent setslofidr'awingV rolls, a bearing bracket having bearingsfQr the`stub shaft vat Vo1c1IKJsitesides` of the -lb/elt and Abetween the belt and the Ylarger ends of the scavenger rolls and pivota'lly mounted .on the'frame beneath and lparallel to -thefdrawing rolls't'o position` the scavenger rolls respectively beneath adjacentfset's of drawing rolls, Yand a `spring between the bear-1 ing bracket and the frame acting totension'fthe .5. ma 'yarn forming frame'having thecomcinetica danneggia elairfiz a, in' which the said bearings for `the stub fshafgtare lopen and downlwardlyvfacing'to enable -thestub shaft, upon re?- laxationof the spring, readily to -beremovedand replacedj 'i 

